218828 has 12 divisors (see below), whose sum is σ = 386232. Its totient is φ = 108480.

The previous prime is 218819. The next prime is 218833. The reversal of 218828 is 828812.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 218828.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 218828.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788 + ... + 1028.

It is an arithmetic number, because the mean of its divisors is an integer number (32186).

2²¹⁸⁸²⁸ is an apocalyptic number.

It is an amenable number.

218828 is a deficient number, since it is larger than the sum of its proper divisors (167404).

218828 is a wasteful number, since it uses less digits than its factorization.

218828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 470 counting only the distinct ones).

The product of its digits is 2048, while the sum is 29.

The square root of 218828 is about 467.7905514223. The cubic root of 218828 is about 60.2607173189.

The spelling of 218828 in words is "two hundred eighteen thousand, eight hundred twenty-eight".